Rotoscoping too slow

Depending on what version of After Effects and Roto Brush you are using, the expectation is that performance is much better when using Roto Brush 3, and starting with Ae 24.2, we also improved Freeze render times so Roto Brush can take advantage of pre-existing propagated frames when performing the Freeze process.

Our internal testing indicates Freeze is now 1.6x to 5.8x faster to complete. Performance results can vary depending on platform, OS version, and GPU. Older GPUs will see the biggest performance gains. Performance gains are reduced when using the Refine Edge Tool (1.2x to 1.6x faster).

I can't explain the CPU usage or performance slow down you’re experiencing, but please let us know if you’re encountering the problem when using Roto Brush 3, and Ae 24.2 or higher

Thanks